The JCB operator was blindfolded and kidnapped with a gun pointed to his head by the Assam Police wearing commando uniform.
The appointment letters were handed over at a programme organised to mark the 100 days of BJP-led government under Chief Minister Himanta Biswa Sarma.
The miscreants triggered a blast at an Assam government-run lower primary school in Hailakandi district on Friday night.
Congress alleged that Meghalaya marked the border after the drone survey, and moved an adjournment motion for a discussion on the issue in the Assembly.
The development happened after Assam and Mizoram ministers met last week to thrash out differences and agreed to maintain calm along the border and resolve their differences amicably.
In order to understand the clash between Assam and Mizoram place, we have to go back to the British colonial government’s outlook to frontier management
The committees will aim at resolving the border disputes in a phased manner in six of the 12 disputed sites initially, the chief ministers said at a joint press conference.
The two states agreed to maintain peace along the interstate border and welcomed the deployment of neutral force by the Government of India.
The blockade has been imposed in all three districts of Assam's Barak Valley -- Cachar, Karimganj and Hailakandi. They share a 164.6 km border with Mizoram.
Following the July 26 violence, both Assam and Mizoram Police registered separate cases naming each others' political leaders and police and civil officials.
Sarma's tweet comes after Union Home Minister Amit Shah spoke to both Assam Chief Minister Himanta Biswa Sarma and Mizoram CM Zoramthanga telephonically earlier in the day.
Officials in Assam's Barak Valley said the vehicular movement has totally been stopped even though there is no bar in travelling from one state to the other.
The Mizoram Police booked Assam CM Himanta Biswa Sarma, four senior Assam Police officers and two officials on different charges, including 'attempt to murder', 'criminal conspiracy' and 'assault'.
The decision was made at a meeting, held between the chief secretaries of the two states, in Nagaland’s Dimapur town. There was a standoff going on between the police forces of the two states.
“If he doesn’t depose, we will have to take the next step which is (issuance of) warrant (against him),” Assam’s Special Director-General of Police, GP Singh said.